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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed5c4b92d10f99b20184a602c062ade54e7b98e025c516e6e8ee9273f07af5b' 
  AND token = 'T+7HwJ6GhE6mV98VnN/65N1EiCp/2+ywahmR+I9y/zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}